Introduction: The ESP-01 is a popular and versatile Wi-Fi module that can be easily programmed and interfaced with various sensors. In this project, we will use the ESP-01 along with the DHT11 temperature and humidity sensor to create a simple weather station. We will measure temperature and humidity readings and display them on a web server hosted by the ESP-01.
Materials Required:
ESP-01 module
DHT11 temperature and humidity sensor
USB to TTL converter
Breadboard and jumper wires
3.3V power supply
Arduino IDE and ESP8266 board support package
Circuit Diagram:
Steps:
Setting up Arduino IDE:
Open Arduino IDE and go to File > Preferences.
Add the following URL to the Additional Board Manager URLs: http://arduino.esp8266.com/stable/package_esp8266com_index.json
Go to Tools > Board > Boards Manager, search for "ESP8266" and install the package.
Connecting ESP-01:
Connect the ESP-01 to the USB to TTL converter as follows:
ESP-01 VCC to 3.3V, GND to GND, TX to RX, and RX to TX.
Enable GPIO0 and GPIO2 by connecting them to VCC with a 10k resistor.
Connect the DHT11 sensor to the ESP-01 as follows:
DHT11 VCC to 3.3V, GND to GND, and data pin to GPIO2.
Coding:
Open Arduino IDE and select the ESP8266 board from Tools > Board menu.
Use the following code to read temperature and humidity from the DHT11 sensor and host a web server to display the readings:
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <DHT.h>
const char* ssid = "your-ssid";
const char* password = "your-password";
DHT dht(2, DHT11);
ESP8266WebServer server(80);
void handleRoot() {
float temperature = dht.readTemperature();
float humidity = dht.readHumidity();
String message = "Temperature: " + String(temperature) + "°C\nHumidity: " + String(humidity) + "%";
server.send(200, "text/plain", message);
}
void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("WiFi connected");
dht.begin();
server.on("/", handleRoot);
server.begin();
Serial.println("Web server started");
}
void loop() {
server.handleClient();
}
Replace your-ssid and your-password with your Wi-Fi network credentials.
Testing:
Upload the code to the ESP-01.
Open the serial monitor to view the ESP-01's IP address.
Enter the IP address in a web browser to see the temperature and humidity readings.
Conclusion
In this project, we successfully built a weather station using the ESP-01 and DHT11 sensor. This project can be further expanded by adding more sensors or incorporating data logging capabilities. The ESP-01's flexibility and ease of use make it an ideal choice for IoT projects.
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